Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Mendoza's method for clearing lunars.
    From: Frank Reed CT
    Date: 2004 Aug 7, 14:05 EDT
    George H wrote:
    "Included are all the five methods of Norie (Krafft, Borda,Witchell. Mendoza, Lyon), with an
    example of each, together with table XXXV. "

    For anyone else interested in the methods in Norie, the edition available online is very nearly identical:


    It's from twenty years earlier (during the heyday of lunars). The only change in the lunars methods from 1828 to 1848 was the replacement of Dunthorne's method by Krafft's (a method of natural versed sines) which became popular later than it should have.

    A far back as 1796, Mendoza Rios himself expressed his fondness for a method in natural versines and lamented the fact that tables of versed sines were not widely available. As late as 1908, Dunraven recommends only one method for clearing lunars, a method in natural versines of which, compared to other clearing methods, he says "appears to me the simplest of them all, and the easiest to remember". He cautions that it is not "advocated generally", but I think that's just his style.

    Frank R
    [ ] Mystic, Connecticut
    [X] Chicago, Illinois
    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)